Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5483e7d153df3c6…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 09:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9b165b00f491434c344c00a37379ad80 SHA-1: 9631e9cf0d269442e1344f761f30fdf2b5cd42c9 SHA-256: c5483e7d153df3c6db3c60549163f8c327271377bae0d8983af91bb98bdb171c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/strik?utm_term=dark+souls+2+wikidot+armor PDF link annotation
    • https://wixugowodekawa.weebly.com/uploads/1/3/1/4/131438135/41f40481d02fb.pdfIn PDF document text
    • https://gaparomid.weebly.com/uploads/1/3/4/6/134632142/luvaxevunur.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/sowonenukivopuxig.pdfIn PDF document text
    • https://gutavavoz.weebly.com/uploads/1/3/4/0/134000423/dobogugev.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/ihiisQ4/room_escape_contest_2_level_26.pdfIn PDF document text
    • http://wegoluxetas.scienceontheweb.net/bukujinarozomutorumejet.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/91966550865.pdfIn PDF document text
    • https://widoripitobagat.weebly.com/uploads/1/3/4/8/134882637/finulab.pdfIn PDF document text
    • http://sarhello.online/11303413351rxr1x.pdfIn PDF document text
    • https://vakajufatig.weebly.com/uploads/1/3/5/3/135332685/9759485.pdfIn PDF document text
    • https://jaradaka.weebly.com/uploads/1/3/0/8/130813635/34e0b5792e24f.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/barfu_am_klavier_piano_sheet_music.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/zemux_bifanu_dadirexopa_ruzopikukonofe.pdfIn PDF document text
    • http://espacecmb.xyz/ethical_hacking_course_in_jaipurupgfe.pdfIn PDF document text
    • http://usblighter24.site/algorithms_illuminated_part_3_drivemtyg5.pdfIn PDF document text
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/d789d.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/icjilgf/xabev.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/taxurobafoweromuz.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/19841444725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_40b8ba4c046b4675b33670af8efc8321.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_b1b82b8d32854963b532e8b0557ef8d7.pdf?index=trueIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_0f42d2427ae246fba972214ddd07b40a.pdf?index=trueIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_e5903844b2d24cf8ba3b36de1cffa5e1.pdf?index=trueIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_53d9772d6ade4002a424e94121b1ba34.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 5256 bytes
SHA-256: 7465fa19c36a0ad3e0dbf0a943d20db0b30939f85ebf59122c5adff7f41731d8
font_01_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 10836 bytes
SHA-256: 6276643280d840f5ebbdb2c4cc4ba5649eaa40a005febaf58ad22d5c572c77e4